JP4139900B2 - Damping device for wooden building and damping method for wooden building - Google Patents

Description

  The present invention relates to a vibration control device for a wooden building and a vibration control method for a wooden building.

  As a means for reducing the vibration generated in the wooden building due to an earthquake or a strong wind, as shown in FIG. It is known that a rigid bracing T is provided on the door, and, as shown in FIG. It has been.

The above-described means for reducing vibration has the following problems.
(1) As shown in FIG. 12A, when the bracing T is used, the rigidity is increased, but the energy absorption performance is low and vibration is directly transmitted to the building. For this reason, a building is easy to be damaged, and when vibration increases, there is a high possibility of destruction.
(2) As shown in FIG. 12 (b), in the case of damping vibration with the damper V, if the rigidity of the pillar material A is low, the pillar material A is deformed by the force of the damper V. For this reason, the damper V is not easily deformed, that is, the damper V hardly absorbs energy during vibration, and a sufficient damping effect cannot be obtained.

  The present invention has been made to solve the conventional problems as described above, and is a wooden building damping device and a wooden building capable of exhibiting excellent damping performance regardless of the magnitude of vibration. The purpose is to provide a vibration control method.

In order to solve the above-described problems, the first invention of the present application includes two parallel column members and two horizontal members that are connected to the two column members in parallel vertically. And a damping device for a wooden building for dampening the vibration generated in the
A damper body configured by inserting an inner cylinder into the outer cylinder and interposing a viscoelastic material between the inner cylinder and the outer cylinder;
A damper body having a column member attachment member and a horizontal member attachment member attached to the free ends of the inner cylinder and the outer cylinder by pin joining,
A column member mounting member is attached to one column member with a screw, and a horizontal member mounting member is installed to one horizontal member with a screw.
In order to increase the rigidity of one column material, it was formed in a shape that increases the secondary moment of inertia around the depth direction axis of one column material, and it was formed in a strip shape that extends almost in the height direction of one column material A rigid reinforcement,
It is provided with.

  The second invention of the present application is characterized in that, in the first invention, the rigid reinforcing material is formed so as to spread in a width direction of the column material.

Further, the third invention of the present application is for damping vibrations generated in two parallel column members and two parallel horizontal members respectively joined to the two column members. A vibration control method for wooden buildings,
A damper body configured by inserting an inner cylinder into the outer cylinder and interposing a viscoelastic material between the inner cylinder and the outer cylinder;
A damper body having a column member attachment member and a horizontal member attachment member attached to the free ends of the inner cylinder and the outer cylinder by pin joining,
A column member mounting member is attached to one column member with a screw, and a horizontal member mounting member is attached to one horizontal member with a screw .
In order to increase the rigidity of one column material, it was formed in a shape that increased the secondary moment of inertia around the depth axis of one column material, and was formed in a strip shape over almost the height direction of one column material. Provide rigid reinforcement,
The energy absorption of the column material is blocked during vibration,
It is characterized by energy absorption by a damper body ,
It is a vibration control method for wooden buildings.

The damping device for a wooden building and the damping method for a wooden building according to the present invention can obtain at least one of the following effects by means for solving the above problems.
(1) Since the rigidity of the column member, particularly the bending rigidity, is enhanced by the rigid reinforcing material, when the column member and the horizontal member are relatively displaced by vibration, the damper body or the damping member of the damper body is efficiently deformed. It will be. Therefore, since the energy absorption performance of the damper body is enhanced, a sufficient vibration damping effect can be obtained.
(2) The damper body is configured by inserting the inner cylinder into the outer cylinder and interposing a viscoelastic material between the outer cylinder and the inner cylinder, and the free ends of the outer cylinder and the inner cylinder. By comprising each of the pair of attachment members attached by pin joining, the followability of the damper body is improved when the column member and the horizontal member are relatively displaced, so that the energy absorption performance is further enhanced.
(3) Since the column material is easily deformed by the force of the damper body, the rigid reinforcing material is formed in a shape that increases the cross-sectional secondary moment around the depth direction axis of the column material. By forming so as to spread in the width direction, deformation of the column material can be effectively prevented.
(4) By attaching the mounting plates of the column member mounting member and the horizontal member mounting member with screws, loosening of the damper is less likely to occur than when nails or bolts are used.
(5) The rigid reinforcement material is formed in a metal strip shape and attached in the depth direction of the pillar material over almost the height direction, so that it does not interfere with the construction of the building and the weight of the rigid reinforcement material is suppressed. However, the rigidity of the pillar material can be effectively increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Installation Conditions of Vibration Control Device As shown in FIG. 1, the vibration control device 1 includes two parallel column members A and B that form a framework of a wooden building, and these two column members. This is for attenuating the vibrations generated in the two horizontal members parallel to each other, for example, the beam material C and the base material D.
When the vibration damping device 1 has a joint structure between a column member and a horizontal member that causes a relatively large interlayer displacement during vibration, for example, the column members A and B and the horizontal members C and D are fitted together. This is particularly effective when bonded.
As a specific example, each of the column members A and B has tenons A1 and B1 at both ends in the height direction, and the tenons A1 and B1 are fitted into tenon holes (not shown) provided in the horizontal members C and D, respectively. In addition, when connected to the horizontal members C and D, the L-shaped joint attached to the side surface in the width direction of the column material A or B and the side surface in the height direction of the horizontal member C or D This is a case where the column members A and B are joined to the horizontal members C and D by the tool E, respectively.
The column members A and B and the horizontal members C and D have a square cross section here, but the cross sectional shape is not particularly limited when the vibration damping device 1 is installed.

<2> Damping device The damping device 1 includes one pillar material A or B (the pillar material A or B portion positioned between the transverse members C and D) and one transverse member C or D (the pillar material A). , A horizontal member C or D part located between B) and a damper body 2 installed over the column member A or B on which the damper body 2 is installed, and a rigid reinforcing member 3 provided on the pillar member A or B. To do.

<3> Damper Body As shown in FIGS. 2 and 3, the damper body 2 includes a rod-shaped damper main body 20 having a damping material that generates a damping force during vibration, and the damping material is deformed to change in the length direction. The damper main body 20 is constituted by a cane-type damper provided with a column member mounting member 21 and a horizontal member mounting member 22 that are rotatably mounted at both ends in the length direction by pin joining.
The damper main body 20 is configured by inserting an inner cylinder 202 into the outer cylinder 201 and interposing a viscoelastic material 203 as a damping material between the outer cylinder 201 and the inner cylinder 202. That is, the damper body 2 is a viscoelastic damper.
The column member attachment member 21 and the horizontal member attachment member 22 are attached to the free ends of the inner cylinder 202 and the outer cylinder 201 (or the outer cylinder 201 and the inner cylinder 202) by pin joining, respectively. Further, each of the column member mounting member 21 and the horizontal member mounting member 22 is configured by integrally including a mounting plate 210 on the distal end side.
The damper main body 20 may be constituted by a friction damper using a friction material as a damping material in addition to the viscoelastic damper.

<4> Installation of Damper Body The damper body 2 is installed across one column member, for example, the column member A, and one horizontal member, for example, the beam member C. The damper body 2 is installed by attaching the column member mounting member 21 to the width direction side surface portion A2 of the column material A facing the column material B, and attaching the horizontal member mounting member 22 to the height direction side surface portion of the beam material C. Here, it is performed by attaching to the lower surface portion C1. More specifically, the attachment plates 210 of the column member attachment member 21 and the horizontal member attachment member 22 are attached to the column member A and the beam member C by screws 4, respectively. By using the screws 4, it becomes difficult to loosen the attachment of the damper body 2 as compared with the case where nails or bolts are used.
Since the column member mounting member 21 and the horizontal member mounting member 22 and the damper main body 20 are pin-coupled, the damper body 2 is substantially attached to the column member A and the beam member C by pin coupling, respectively. Become.

In installing the damper body 2, in order to enhance the damping action during vibration, that is, the column member mounting member so that the viscoelastic material 203 is easily deformed by the inner cylinder 202 moving forward and backward with respect to the outer cylinder during vibration. It is preferable to attach one of the horizontal member 21 and the horizontal member attaching member 22 to the base material D of the column material A or the column material B of the beam material C. In this case, either one of the column member mounting member 21 and the horizontal member mounting member 22 is moved closer to the beam member C of the column member A (see FIG. 4A) or closer to the column member A of the beam member C. By attaching to (refer FIG.4 (b)), the space in the frame comprised with the column materials A and B and the horizontal members C and D is fully ensured.
When the space in the frame composed of the column members A and B and the horizontal members C and D may be sacrificed, the column member mounting member 21 is mounted near the base material D of the column member A, and The frame mounting member 22 can be mounted near the column material B of the beam material C (see FIG. 4C).
Alternatively, the damper body 2 may be installed across the pillars A and B (see FIG. 4D) or between the horizontal members C and D (see FIG. 4E).
The length of the damper main body 20 of the damper body 2 is set in advance according to the mounting position of the damper body 2 on the column member and the horizontal member.

<5> Rigid Reinforcement Material The rigid reinforcement material 3 is provided on the column material A in order to increase the rigidity of the column material on which the damper body 2 is installed, for example, the column material A (see FIG. 1).
Since the pillar material A receives the tensile force or the compressive force of the damper body 2 at the time of vibration, it tends to bend or bend in the width direction. Therefore, in order to prevent or suppress such deformation, it is preferable to form the rigid reinforcing member 3 in such a shape as to increase the cross-sectional secondary moment around the depth direction axis of the column A. That is, it is effective to form the rigid reinforcing material 3 so as to spread in the width direction of the pillar material A. On the other hand, in order to increase the rigidity of the columnar material A, it is preferable to provide the rigid reinforcing material 3 over almost the height direction of the columnar material A. Therefore, more specifically, here, the rigid reinforcing material 3 is formed in a metal belt shape and attached to the side surface portion A3 in the depth direction of the columnar material A substantially in the height direction.
With such a configuration, the rigidity of the pillar material A can be effectively increased while not obstructing the construction of the building and suppressing the weight of the rigid reinforcing material 3 itself.
In attaching the rigid reinforcing material 3 to the pillar material A, screws (not shown) can be used in the same manner as the attachment of the damper body 2 to the pillar material A and the beam material C. It is effective to provide a plurality of screws over almost the height direction of the rigid reinforcing member 3 without leaving a gap.

By providing the stiffener 3 on the column A, the rigidity of the column A is increased, and as shown in FIG. 5, the damper body 2, more specifically, the viscoelastic material 203 is efficiently deformed during vibration. Therefore, the viscoelastic material 203 can generate a large damping force. That is, the energy absorption performance of the damper body 2 is improved by preventing the energy absorption of the pillar material A during vibration.
Accordingly, the damper body 2 can be miniaturized, and the space in the frame composed of the column members A and B and the horizontal members C and D is used for an opening such as an entrance of a building. However, the vibration damping device 1 can be applied.

<6> Modification Example of Rigid Reinforcement Material As shown in FIG. 6, the rigid reinforcement material 3 can also be configured with a plywood bearing wall. In this case, the rigid reinforcing material 3 is attached to the column material A and attached to the adjacent spans of the horizontal members C and D. More specifically, the column material A is attached to the side surface portion A3 in the depth direction and the side surface portions in the depth (width) direction of the horizontal members C and D. Furthermore, you may attach to the horizontal pillar C and D, and may attach to the pillar S provided between the pillar materials A and B. FIG.
With such a configuration, excellent vibration damping performance can be exhibited, so that interlayer deformation during vibration can be further reduced.

<1> Forced Deformation Excitation Experiment Here, as an example, using a test body (damping structure) provided with a vibration damping device 1 having a band-shaped rigid reinforcing material 3, a layer shear force f-layer of the test body An experiment was conducted to measure the relationship of the displacement u.
The test body was composed of two parallel column members A and B as described above, and upper and lower horizontal members C and D respectively joined to the column members A and B (see FIG. 1).
In the experiment, as shown in FIG. 7, a dynamic loading apparatus I including a dynamic actuator G and a movable base H is used, and the test body is fixedly placed on the movable base H, and the center portion of the beam C The jig J attached to was connected to the reaction force column L with a tie rod K. Then, the dynamic actuator G was operated to shake the movable base H, and an experiment was performed by applying a dynamic load in the width direction to the test body. At the time of loading, the interlaminar deformation angles of the test specimens are in order of 1/480, 1/360, 1/240, 1/180, 1/120, 1/240, 1/90, 1/60, 1/120, 1/120. It was set to 45 and 1/30 rad, and the positive and negative alternating cycles were repeated three times at each interlayer deformation angle. The layer shear force f acting on the test body was calculated from the axial force generated on the tie rod K. The interlaminar displacement u of the test body was the interlaminar displacement between the beam material C and the base material D in the test body width direction.
Further, as a comparative example, a similar experiment was performed using a test body in which only the damper body 2 was installed without installing the rigid reinforcing material 3 (the mounting position of the damper body 2 is the same as in the example).
FIG. 8A shows the measurement results of the example, and FIG. 8B shows the measurement results of the comparative example.

<2> Consideration As shown in FIG. 8, it can be seen that the example is a spindle-type history having a wider width than the comparative example. Therefore, the vibration damping device 1 is a conventional type composed of only a damper. It was confirmed that the energy absorption performance is superior compared to the vibration control means.
In addition, since it can be seen that the comparative example is a flat type history and the energy absorption performance was clearly poor, the measurement was performed only when the interlayer deformation angle of the test specimen was 1/120 rad.

<3> Shaking table experiment Next, as an example, the time history of the interlayer displacement u is measured using a test body (damping structure) provided with the damping device 1 having the rigid reinforcing material 3 of the plywood bearing wall. The experiment was conducted.
As shown in FIG. 9, the test body is formed by connecting three frame bodies formed by assembling the column material B, the beam material C, and the base material D in a substantially square shape by the beam material M and the base material N in the depth direction. As a result, the column members A and A are joined to the beam member C and the base member D so as to divide the column members B and B constituting the frame at the intermediate portion in the depth direction into approximately three equal parts. And configured. The damper body 2 is provided so as to be bridged between the respective column members A and the beam members C joined to these column members A, and the rigid reinforcing member 3 is provided with a pair of the column members A, A, the beam members C, and It was attached over the base material D. The column members A and B, the beam members C and M, and the base materials D and N each have substantially the same cross-sectional shape.
The weight P is fixedly placed on such a test body via the top plate O, the test body is fixedly placed on the vibration table Q, and the vibration table Q is accelerated by the dynamic actuator R at an acceleration of 600 cm / s ² . The experiment was performed by swinging in the width direction of the specimen (reproducing an actual earthquake excitation wave) and applying an inertial force to the weight P on the specimen. The interlayer displacement u was the interlayer displacement between the beam material C and the base material D in the width direction of the test body.
Further, as a comparative example, as shown in FIG. 10, an inter-column S is provided between the column members A and B, and a wooden bracing T is provided between the column material A of the beam material C and the column material B of the base material D. A similar experiment was conducted using the test specimens that were installed.
FIG. 11A shows the measurement result of the example, and FIG. 11B shows the measurement result of the comparative example. In addition, the broken line in FIG. 11 represents the interlayer deformation angle 1/120 rad (interlayer displacement about 23 mm).

<4> Discussion As shown in FIG. 11, the example has a smaller maximum interlayer displacement immediately after the excitation and a shorter time until the interlayer displacement is stabilized within about 23 mm, that is, vibration attenuation, as compared with the comparative example. It can be seen that is early. Therefore, it was confirmed that the vibration damping device 1 can obtain a high vibration damping effect and improve the rigidity of the building as compared with the conventional vibration reducing means configured by bracing.

The figure which installed the damping device of the present invention in the pillar material and the horizontal member Diagram showing damper body Sectional drawing which shows the principal part of a damper body Schematic for explaining the mounting position of the damper body The figure which shows the state at the time of vibration of the pillar material and horizontal member which installed the damping device The figure which shows the example of a change of a rigid reinforcement Schematic diagram of forced deformation excitation experiment Figure showing the measurement results of laminar shear force-interlaminar deformation in a forced deformation excitation experiment Schematic diagram of shaking table experiment Schematic of shaking table experiment of comparative example Figure showing measurement results of time history of interlayer displacement by shaking table experiment The figure which shows the conventional vibration reduction means

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damping apparatus 2 Damper body 3 Rigid reinforcement material 20 Damper main body 21 Column material attachment member 22 Horizontal member attachment member 201 Outer cylinder 202 Inner tube 203 Viscoelastic material A Column material (one column material: the other column material)
B Column material (the other column material: one column material)
C Beam material (one horizontal member: the other horizontal member)
D Base material (the other horizontal member: one horizontal member)

Claims (3)

It is a vibration control device for a wooden building to damp vibrations generated by two parallel pillars and two horizontal members joined to these two pillars. And
A damper body configured by inserting an inner cylinder into the outer cylinder and interposing a viscoelastic material between the inner cylinder and the outer cylinder;
A damper body having a column member attachment member and a horizontal member attachment member attached to the free ends of the inner cylinder and the outer cylinder by pin joining,
A column member mounting member is attached to one column member with a screw, and a horizontal member mounting member is installed to one horizontal member with a screw.
In order to increase the rigidity of one column material, it was formed in a shape that increases the secondary moment of inertia about the axis in the depth direction of one column material, and was formed in a strip shape that extends almost in the height direction of one column material. A rigid reinforcement,
Characterized by comprising
Vibration control device for wooden buildings.   2. The vibration control device for a wooden building according to claim 1, wherein the rigid reinforcing material is formed so as to spread in a width direction of the pillar material. A damping method for a wooden building for attenuating vibration generated in two parallel pillars and two parallel horizontal members joined to each of the two pillars,
A damper body configured by inserting an inner cylinder into the outer cylinder and interposing a viscoelastic material between the inner cylinder and the outer cylinder;
A damper body having a column member attachment member and a horizontal member attachment member attached to the free ends of the inner cylinder and the outer cylinder by pin joining,
A column member mounting member is attached to one column member with a screw, and a horizontal member mounting member is attached to one horizontal member with a screw .
In order to increase the rigidity of one column material, it was formed in a shape that increased the secondary moment of inertia around the depth axis of one column material, and was formed in a strip shape over almost the height direction of one column material. Provide rigid reinforcement,
The energy absorption of the column material is blocked during vibration,
It is characterized by energy absorption by a damper body ,
Vibration control method for wooden buildings.

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